After Richard's defeat at the
Battle of Bosworth Field on 22 August 1485, Lincoln was reconciled with the new king,
Henry VII, but soon became impatient with the new rule. A clergyman named Symonds introduced him to his protégé, Lambert Simnel, who bore a resemblance to Edward, Earl of Warwick. Lincoln decided to promote Edward as the "true" Yorkist heir, while using Simnel to represent him, thus allowing Lincoln to become the actual leader of the Yorkists. Lincoln travelled to Burgundy to persuade his aunt
Margaret, Duchess of Burgundy to finance a military expedition to take the throne from Henry. While nominally supporting Simnel, "in private, he probably saw his own accession as the ultimate goal of the enterprise." With an army of mercenaries, Lincoln sailed to Ireland, where he was supported by
Gerald FitzGerald, 8th Earl of Kildare, who was keen to see a return to Yorkist rule in England. This was mainly because the Yorkist kings had allowed Irish self-government with FitzGerald as almost the "uncrowned king of Ireland". Simnel was proclaimed king in Ireland and crowned in Dublin as "Edward VI". With his army swelled by Irish recruits led by FitzGerald's brother
Thomas FitzGerald of Laccagh, Lincoln landed at
Piel Island in Lancashire and proceeded to march towards York, formerly a stronghold of Richard III's supporters. However, the town refused to surrender to Lincoln. The Yorkists secured a victory over a small Lancastrian force at Bramham Moor and Lincoln managed to avoid Henry's main northern forces, which moved away when they received news that York was under attack. This may have been a diversion planned by the Yorkists. Lincoln's army was, however, repeatedly harassed by Lancastrian cavalry under Sir Edward Woodville. The Yorkists then crossed the river Trent and set up their position at the top of a hill near the village of East Stoke. Soon the vanguard of the main Lancastrian army under
John de Vere, 13th Earl of Oxford caught up with them. In the subsequent
Battle of Stoke Field on 16 June 1487, the Yorkist army was conclusively defeated. Lincoln himself was killed in the battle along with most of the other Yorkist leaders. In November 1487, he was posthumously attainted. His death did not end the de la Pole claim to the throne. His younger brother
Edmund de la Pole, 3rd Duke of Suffolk, became the leading Yorkist claimant to the throne until his execution by orders of
Henry VIII in 1513. Their younger brother
Richard de la Pole continued their claim until his own death at the
Battle of Pavia (24 February 1525) while a fourth brother,
William, was held prisoner in the
Tower of London for 37 years, dying in 1539. ==Marriage and issue==